[v6,1/5] PCI: Handle IORESOURCE_PCI_FIXED when sizing resources.

From: David Daney <david.daney@cavium.com>

The new Enhanced Allocation (EA) capability support (patches to
follow) creates resources with the IORESOURCE_PCI_FIXED set. Since
these resources cannot be relocated or resized, their alignment is not
really defined, and it is therefore not specified.  This causes a
problem in pbus_size_mem() where resources with unspecified alignment
are disabled.

So, in pbus_size_mem() skip IORESOURCE_PCI_FIXED resources, instead of
disabling them.

Acked-by: Sean O. Stalley <sean.stalley@intel.com>
Signed-off-by: David Daney <david.daney@cavium.com>
---
 drivers/pci/setup-bus.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Bjorn,

A small snafu...

On 10/20/2015 04:04 PM, David Daney wrote:
> From: David Daney <david.daney@cavium.com>
>
> The new Enhanced Allocation (EA) capability support (patches to
> follow) creates resources with the IORESOURCE_PCI_FIXED set. Since
> these resources cannot be relocated or resized, their alignment is not
> really defined, and it is therefore not specified.  This causes a
> problem in pbus_size_mem() where resources with unspecified alignment
> are disabled.
>
> So, in pbus_size_mem() skip IORESOURCE_PCI_FIXED resources, instead of
> disabling them.
>
> Acked-by: Sean O. Stalley <sean.stalley@intel.com>
> Signed-off-by: David Daney <david.daney@cavium.com>
> ---
>   drivers/pci/setup-bus.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 508cc56..4dfef10 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -1037,9 +1037,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
>   			struct resource *r = &dev->resource[i];
>   			resource_size_t r_size;
>
> -			if (r->parent || ((r->flags & mask) != type &&
> -					  (r->flags & mask) != type2 &&
> -					  (r->flags & mask) != type3))
> +			if (r->parent || (r->flags | IORESOURCE_PCI_FIXED) ||

Should be:

   r->flags & IORESOURCE_PCI_FIXED

With the erroneous '|', sizing of bridge resources can break.

Q:  How to fix this.

   A) Replace this patch entirely?

   B) A patch on top of this one?


> +			    ((r->flags & mask) != type &&
> +			     (r->flags & mask) != type2 &&
> +			     (r->flags & mask) != type3))
>   				continue;
>   			r_size = resource_size(r);
>   #ifdef CONFIG_PCI_IOV
>

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On Thu, Oct 29, 2015 at 01:57:10PM -0700, David Daney wrote:
> Bjorn,
> 
> A small snafu...
> 
> On 10/20/2015 04:04 PM, David Daney wrote:
> >From: David Daney <david.daney@cavium.com>
> >
> >The new Enhanced Allocation (EA) capability support (patches to
> >follow) creates resources with the IORESOURCE_PCI_FIXED set. Since
> >these resources cannot be relocated or resized, their alignment is not
> >really defined, and it is therefore not specified.  This causes a
> >problem in pbus_size_mem() where resources with unspecified alignment
> >are disabled.
> >
> >So, in pbus_size_mem() skip IORESOURCE_PCI_FIXED resources, instead of
> >disabling them.
> >
> >Acked-by: Sean O. Stalley <sean.stalley@intel.com>
> >Signed-off-by: David Daney <david.daney@cavium.com>
> >---
> >  drivers/pci/setup-bus.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> >
> >diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> >index 508cc56..4dfef10 100644
> >--- a/drivers/pci/setup-bus.c
> >+++ b/drivers/pci/setup-bus.c
> >@@ -1037,9 +1037,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
> >  			struct resource *r = &dev->resource[i];
> >  			resource_size_t r_size;
> >
> >-			if (r->parent || ((r->flags & mask) != type &&
> >-					  (r->flags & mask) != type2 &&
> >-					  (r->flags & mask) != type3))
> >+			if (r->parent || (r->flags | IORESOURCE_PCI_FIXED) ||
> 
> Should be:
> 
>   r->flags & IORESOURCE_PCI_FIXED
> 
> With the erroneous '|', sizing of bridge resources can break.
> 
> Q:  How to fix this.
> 
>   A) Replace this patch entirely?
> 
>   B) A patch on top of this one?

No problem, I fixed it and repushed the pci/enhanced-allocation branch:

https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/enhanced-allocation
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